Digitalisation of the Moscow Subway Circle Line

To replace the outdated automation equipment of the 1950s, the line was upgraded with microprocessor-based equipment designed and manufactured by NPS companies.

The upgrade made it possible to increase the number of train pairs to 45 per hour, reduce intervals to 1 min 20 seconds, making the line among the best in the world.

Before the upgrade, there were no more than 32 pairs of trains per hour; the interval was 1 min 53 seconds. Equipment failures slowed down the traffic and it took about an hour to fix it.

Digital systems monitor the hardware parameters and inform about deviations in good time: this allows fault risks to be identified before failure. The line is managed by a single control centre, which significantly reduced staff workload and increased efficiency.

During the Circle Line project, our staff:

• implemented computer-based interlocking, track circuit monitoring systems, traffic control and automatic diagnostics;

• upgraded power equipment of traction substations for reliable power supply;

• upgraded communications, fire and security alarm, ventilation and air conditioning systems.